Expansible packer for plungers



Maid, 22, 1921. 1,622,043

E. E. MILLER EXPANSIBLE PACKER FOR PLUNGBRS Filed June 12, 1925 PatentedMar. 22, 1927.

nawm mam- .1a er summatio CALIFORNIA.

EXPQNSIFQE13433133301535-.YLQHGEWS! Application med-111M 12, 1925.Serial No. 36,672. 5; J' il:] ugrmi This invention relates toiinqarovihents in plungers for pumps andth'el ke. I

An obj ect' of the invention- "is to prov de a plunger'havinga'pliiliger 'rodpnfwh chtwo heads "are mounted, and between which headsthere is arranged an expihsible-packing adapted to be expanded the fluidpressure. U

Another object of the inventionis to provide a sealing inean's forpievent'ing the leakage of fluid btftiVBIltlhQjl'litdS? Ain'rtthefobjdtof the intention s to provide pump p un er having a p-21 oi headsbetween which arranger fan: exp ain siblep'ac'ki-ng adapted 'to beexpanded hyfthe flnidpressure, and to provide a separate means forclosing the passages which admit the fluid pressure to the space betweenthe heads and the expansible packing;

WVith' t-he foregOin'ghncPot'her objects H1 view which will behiade'manifest intihe following detailed description and sfpe c i fica'lly pointed out ela ms, reference is had to'the'accompanying drawingsfor an illustrative embodiment of the invention, wherein:

Figure 1 is a vertical section through a pump barrel or cylinder andthrough the plunger of the improved construction disposed therein,

Fig. 2 is a side elevation of the improved plunger,

Fig. 3 is an end elevation of the plunger and may be considered as takenin the direction of the arrow 3 upon Fig. 2,

Fig. 4. is a perspective view of one of the heads, I

Fig. 5 is a perspective view of the expansible packing, and

Fig. 6 is a perspective view of the sealing lgeferring to theaccompanying drawings wherein similar reference characters" deslgnatesimilar parts throughout, the plunger consists of a plunger rod 10 whichis tapered, as indicated at 11, and which is provided with a cylindricalthreaded end 12. Heads 13 and 14 are arranged upon the plunger rod andhave projecting hubs 15 and 16 which abut each other. The heads aremaintained upon the plunger rod 10 by means of a nut 17 and a lock nut18. On the opposed faces of the heads 13 and 14 there are formed annularshoulders 19 and 20. The expansible packing 21, which may be formed ofsoft, flexible rubber or equivalent *in aterial, disposed between theheads and lies its'lendportions engageable upon and arranged about'theannular shoulders 19 and E20." Apertures 22 are formed longitudinallythrouglifithe "heads between the hubs 15f andltiand their respectiveshoulclers19endi'2t).* A sealing ring 23'is dis posed'ahout" the hubs"15 and '16 and has ou tward l y'extend-in g flanges Q/l -which bearagainst the opposed faees' f the heads'13 and '14. The sealing ringispreferably seemeder soft, flesjitle rather orequivalent material, andits flanges 24, becauseof their resiliency,act as check ValvesGLClOSHll-ES for the inner ends ofthe apertures 22.

"The operation ofthe pl nger is as follo WsFUpOI-i reci 'g'rocation fofthe plunger, the fluidpressur-e within thebarrel or cylin d-er of thepum-p enters through the aper+ tlures 22, and escapes past the flanges'24 on the sealing ring 23, lilling the chamber" 525 and thus expandingthe expansible packing 21. against theinterim-surfaces of the barrel.'The sealihg' 23 prevents) leakage of fluidhetiveeii-thedbutt'ingsurfaces on the hubs 15 and 16, and as it is detached from theexpansible packing, any movement of the flanges 24, in opening orclosing the apertures 22 in no way interferes with or influences theexpansible packing. WVhen the packing 21 is slightly expanded, its endportions will disengage from the exterior surfaces of the shoulders 19and 20, so that the pressure within the chamber 25 is applied betweenthe shoulders and the packing. This causes the end portions of theexpansible packing to bear or expand against the interior surfaces ofthe pump barrel or cylind-er with as great a force as that which isapplied at the center of the expansible packmg. This is an importantfeature on plun ers of this type for the reason that the outer edges ofthe expansibl-e packing become chipped and chewed up so that after thepacking has been slightly worn, it is diflicult to make the end portionsof the packing fit snugly against the interior of the barrel. Thepressure beneath the end portions of the packing maintains theseportions in their expanded or bearing positions.

It will be readily appreciated that this form of plunger can be easilyand quickly constructed, the packing 21 being shown merely in the formof a cylindrical ring which can be easily molded. Although the packing21 is illustrated as being in the form of a smooth ring, it can bemodified if so desired.

It will be understood that various changes in the detail of constructionmay be made without departing from the spirit or scope of the inventionas defined by the appended claims.

I claim:

1. A pump plunger comprising a plunger rod, means providing heads uponthe rod, an expansible packing arranged between the heads, meansproviding passages through which fluid may be admitted between the headsto expand the packing, and a separate ring detached from the packing andspaced therefrom disposed between the heads, said ring having flangeportions serving as closures for the passages.

2. A pump plunger comprising plunger rod, means providing heads upon therod, an expansible packing disposed between the heads, a sealing ringdisposed between .the heads, and means providing passages through theheads through which fluid pressure may enter the space between the headsto expand the packing, said sealing ring serving to prevent leakagebetween the heads and having outwardly extending flanges adapted toclose said passages.

3. A plunger for pumps and the like comprising a plunger rod, meansproviding heads upon the plunger rod having annular shoulders formedontheir opposed faces,

an expansible packing disposed between the heads having end portlonsengageable upon the shoulders, means providlng passages whereby fluidpressure'n'iay be admitted to the space between the heads, and meansproviding closures for said passages.

4. A plunger for pumps and the like com prising a plunger rod, meansproviding heads upon the plunger rod having annular shoulders formed ontheir opposed faces, an expansible packing disposed between the headshaving end portions engageable upon the shoulders, means providingpassages whereby fluid pressure may be admitted to the space between theheads, and a sealing ring disposed between the heads for preventingleakage therebetween, said sealing ring having outwardlyextendingflanges adapted to close said passages.

5. A pump plunger comprising a plunger rod, heads mounted upon the rodhaving abutting hubs and having annular shoulders formed upon theiropposed faces, a sealing ring disposed about the abutting hubspreventing leakage therebetween, an expansible packing disposed betweenthe heads having end portions engageable upon the shoulders, there beingpassages formed through the heads, and flanges upon the sealing ringadapted to close said passages.

In testimony whereof I have signed my name to this specification.

ERWIN E. MILLER.

